Archive for February 2011

Reaching multiple instances of the same IP address

A friend recently presented me with the following challenge: Configure a system through which several appliances, all of them having an identical, non-routable, default IP configuration, can be reached simultaneously. All appliances are preconfigured with an IP address of and they had no routing configuration enabled. Yet they should all be reachable over the […]

Path MTU discovery ICMP messages

This is more for my own reference… After configuring my ADSL modem to run i bridge mode, it seems I’m running into a few path MTU issues. To identify any path MTU messages, I’ve been analyzing the traffic on the outside interface looking for path MTU issues using the following tcpdump syntax: tcpdump -n -s0 […]